I also highly recommend getting a canopy from Todd's Canopies (if it is not too late). Better canopy overall and it will provide an extra 2-4 inches of vertical sitting height for you, as their canopy is molded a little differently.

I'm only 5'10" but using Todd's canopy allowed me to raise my seat height (using Oregon Aero foam) about 2" higher than where I'd sit with a normal Van's canopy. I flew my friends RV-4 the other day and I felt like I was sitting very low and still did not have much room between the top of my headset and the canopy.

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